i'm here talking with steven and jim. you're there, you were there to help the elite athletes, thinking you're going to deal with cramps and dehydration. what happened, steven? >> the first thing we heard was the explosion, then we felt the concussion in the room. then several of us went running towards the front door. then we heard the second explosion, and then two or three of us kept going. and then the group kept going back, waiting for the casualties. so half of us went forward to the wounded and half stayed back. >> jim, what do you see when you get to the casualties? >> lots of smoke and confusion, lots of blood. lots of injured patients. for me, it was just a flashback to iraq. carrying that first explosion, i knew it was an ied. usually they come in twos, sometimes threes. sometimes they wait for people to come out and they set off the third one or the second one. there were two. they stopped the third one, thankfully. and we had to make room in the medical tent from the athletes, the marathoners, to move forward